from django.test import Client

class ViewTestCaseMixin:
    view = None
    
    def setUp(self):
        self.view_name = self.view.__name__
        self. client = Client()
    
    def _test_has_context_key(self, response, context_key):
        self.assertTrue( context_key in response.context,
            msg='Expecting the context of %s to have an attribute \'%s\'' % (
                self.view_name,
                context_key
            )
        )
        
    def assertHasForm(self, response, context_key, form_class):
        self._test_has_context_key(response, context_key)
        self.assertEqual(
            type(response.context[context_key]),
            form_class,
            msg='Expecting %s\'s context.%s to be of the type %s' % (
                self.view_name,
                context_key,
                form_class.__name__
            ) 
        )

    def assertHttpCode(self, response, code):
        self.assertEqual(
            response.status_code, code,
            "Expected an HTTP %s response, but got HTTP %s" % (
                code,
                response.status_code
            )
        )

    def assertHttpOK(self, response):
        self.assertHttpCode(response, 200)

    def assertHttpCreated(self, response):
        self.assertHttpCode(response, 201)

    def assertHttpRedirect(self, response, redirect_to):
        '''
        Assert that we had any redirect status code.
        '''

        self.assertTrue(
            300 <= response.status_code < 400,
            'Expected an HTTP 3XX (redirect) response, but got HTTP %s' %
            response.status_code
        )
        
        self.assertEqual(response['Location'], redirect_to)


    def assertHttpBadRequest(self, response):
        self.assertHttpCode(response, 400)

    def assertHttpUnauthorized(self, response):
        self.assertHttpCode(response, 401)

    def assertHttpForbidden(self, response):
        self.assertHttpCode(response, 403)

    def assertHttpNotFound(self, response):
        self.assertHttpCode(response, 404)

    def assertHttpMethodNotAllowed(self, response):
        self.assertHttpCode(response, 405)